Re: [PATCH v5 0/3] kdump: Enable LUKS-encrypted dump target support in ARM64 and PowerPC

Andrew Morton
2026-03-25T04:06:44Z

On Wed, 25 Feb 2026 14:03:43 +0800 Coiby Xu <coxu@redhat.com> wrote:

> CONFIG_CRASH_DM_CRYPT has been introduced to support LUKS-encrypted
> device dump target by addressing two challenges [1],
> - Kdump kernel may not be able to decrypt the LUKS partition. For some
> machines, a system administrator may not have a chance to enter the
> password to decrypt the device in kdump initramfs after the 1st kernel
> crashes
>
> - LUKS2 by default use the memory-hard Argon2 key derivation function
> which is quite memory-consuming compared to the limited memory reserved
> for kdump.
>
> To also enable this feature for ARM64 and PowerPC, we need to add a
> device tree property dmcryptkeys [2] as similar to elfcorehdr to pass
> the memory address of the stored info of dm-crypt keys to the kdump
> kernel.

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